6 th Meeting of the Scientific Committee Puerto Varas, Chile, 9-14 September SC6-Doc21 Chinese Taipei s Annual Report

Transcription

1 6 th Meeting of the Scientific Committee Puerto Varas, Chile, 9-14 September 2018 SC6-Doc21 Chinese Taipei s Annual Report

2 2018 National Report of Chinese Taipei to SPRFMO Scientific Committee on the Squid Jigging Fishery in the Southeast Pacific Ocean Summary Jumbo flying squids inhabit in the eastern Pacific and have been targeted by Chinese Taipei s squid-jigging fleet since The number of operating fishing vessels varied from 5 to 29 between 2002 and The catch of jumbo flying squid was 7,338 tons in 2017, less than that of 2016 (12,989 tons). The nominal CPUEs of this fishery were at a similar level for The major fishing grounds were located around W and S, while few vessels operated in the region of W and 2 N 2 S in Data of logbook, transshipment and landing of Chinese Taipei s squid-jigging fleet have been collected entirely and submitted to the Secretariat of SPRFMO. Researches on the stock status and spatial dynamics of jumbo flying squid have been conducted. The length composition of jumbo flying squid was converted from weight category. A biological sampling program has been conducted by one study vessel in the fishing season of The observer program, modified from tuna fishery, has been developed in Description of the Fishery Jumbo flying squid (Dosidicus gigas, also known as Humboldt squid) is a large pelagic squid inhabiting in the eastern Pacific Ocean and its distribution reaches about latitude 50 for both North and South hemispheres. This species has been targeted by Chinese Taipei s distant-water squid-jigging fleet in the Southeast Pacific Ocean since The number of operating vessels varied from 5 to 29 between 2002 and 2017 (Figure 1). The monthly number of vessels for Chinese Taipei s squid-jigging fleet varied inter-annually between 2013 and 2017 (Figure 2). The monthly operation days deployed by Chinese Taipei s squid-jigging fleet in 2017 ranged from 16 days to 300 days (Figure 1

3 3). The main fishing season for D. gigas by Chinese Taipei s squid-jigging fleet occurred from October to December in Catch, Effort and CPUE Summaries Annual catch and fishing efforts of Chinese Taipei s squid-jigging fleet from 2013 to 2017 is shown in Table 1. The annual catch was 7,338 tons in 2017, which was lower than that of 2016 (12,989 tons). The fishing effort (vessel-day) was 1228 v-d in The annual nominal CPUE (tons/vessel-day) of Chinese Taipei s squid-jigging fleet in the Southeast Pacific Ocean from 2013 to 2017 is shown in Figure 4. The nominal CPUE value was 5.98 tons/vessel-day in The annual spatial distributions of average CPUE (tons/vessel-day) of Chinese Taipei s squid-jigging fleet in the Southeast Pacific Ocean from 2013 to 2017 is shown in Figure 5. The major fishing ground for this fishery was around S and W. There had been a number of fishing vessels operating within the EEZ of Peru between 2007 and 2010 with permission of fishing licenses issued by the competent authority of Peru. However, Chinese Taipei s squid-jigging fleet only operated in the high seas of the Southeast Pacific Ocean during the period of 2011 to The fishing ground for the fishery located around W and S in 2017, and there were few vessels operated in equatorial waters ( W and 2 N 2 S). 3. Fisheries Data Collection and Research Activities 3.1. Logbook system All of Chinese Taipei s squid-jigging vessels have been required to maintain fishing logbooks on a daily basis. All of the logbooks had been retrieved between 2002 and In addition, Chinese Taipei s distant-water squid-jigging vessels have been required to 2

4 equip with electronic logbook system (e-logbook) on board since 2007 and to submit their catch information through this system on a daily basis Transshipment and landing data collection In accordance with Chinese Taipei s domestic regulations of, relevant information of transshipment and landing for Dosidicus gigas fishery in the Southeast Pacific Ocean has been collected by the competent authorities and has been submitted to the Secretariat of SPRFMO since 2013 as per CMM Research Researches on the stock status and spatial dynamics of Dosidicus gigas have been conducted by the scientists of Chinese Taipei. In recent years, research projects have been carried out on spatial distribution patterns, CPUE trend, stock status and exploitation rate of this species. The result of researches showed that the distribution of D. gigas abundance was higher in the coastal waters off northern Peru. The size composition harvested by Chinese Taipei s fleet has been dominated by large-size group in recent years. The results of GAM suggested that the variation of squid abundance could be explained by the temporal and spatial variables to a degree. It may result from a long-distant migration pattern for the jumbo flying squid and plasticity in life-history traits of squid populations with a decreasing trend of squid abundance index since 2005 which has also been noted. 3.4 Sampling programs A sample collection program has been conducted in the fishing season of 2018 for basic biological information and population structure studies of D. gigas in the Southeast Pacific. The program is conducted by one study vessel of Chinese Taipei which plan to retain ca. 10 whole-body specimens monthly during the fishing season. The collected samples are carried by the study vessel and the vessel will back to fishing port in Kaohsiung in early 3

5 Biological Sampling and Length/Age Composition of Catches The logbook for Chinese Taipei s D. gigas fishery includes size categories (commercial category in weight). Four categories are recorded: A, <1 kg; B, 1-2 kg; C, >2 kg; and D, processed products (head, tube and fin). The live weight of category D is calculated by a ratio between head, mantle weight and body weight. The processed products might comprise various size categories of the squid, while almost dominated by the extra-large size (>2 kg) individuals. The annual catch by size compositions of D. gigas between 2013 and 2017 is presented in Table Ecosystem Approach considerations There was no bycatch record for the Chinese Taipei s squid-jigging fleet in This may be a result of performing highly selective fishing gears (jigging) and method by the squid-jigging fleet. 6. Observer Implementation Reports The observer program of Chinese Taipei s D. gigas fishery is developing since early The observer program for squid fishery is modified from the observer program for tuna fishery which has been accredited by Regional Fisheries Management Organizations in the Western and Central Pacific. 4

6 Table 1: Annual catches of Dosidicus gigas and fishing effort of Chinese Taipei s squid-jigging fleet in the Southeast Pacific Ocean between 2013 and Year No. of vessels Fishing effort (vessel-day) Catch (tons)

7 Table 2: Annual catches (tons) of Dosidicus gigas by size composition (in live weight) of Chinese Taipei s squid-jigging fleet in the Southeast Pacific Ocean between 2013 and (Category: A, <1 kg; B, 1-2 kg; C, >2 kg; D, non-categorized) Year A B C D Total

8 Figure 1. Annual variations in number of vessels and catch for Chinese Taipei s squid-jigging fleet in the Southeast Pacific Ocean between 2002 and

9 Figure 2. Monthly variations in number of vessels for Chinese Taipei s squid-jigging fleet in the Southeast Pacific Ocean from 2013 to

10 Figure 3. Monthly fishing days deployed by Chinese Taipei s squid-jigging fleet in the Southeast Pacific Ocean in

11 Figure 4. Annual nominal CPUE of Dosidicus gigas of Chinese Taipei s squid-jigging fleet in the Southeast Pacific Ocean between 2013 and

12 Figure 5: Spatial distributions of annual average CPUE of Dosidicus gigas of Chinese Taipei s squid-jigging fleet in the Southeast Pacific Ocean from 2013 to